Allis Chalmers Model U – specifications
Series: Other models
Build year not documented · Data origin: Reference work (Wikipedia/Wikibooks) · sources
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The Allis Chalmers Model U is a tractor made by Allis Chalmers. It runs on a four-cylinder engine.
The gearbox is a manual unit.
It runs on petrol; the engine is water-cooled. As standard, it runs on 28x6 steel or 6.00x16 rubber tyres at the front and 42x11 steel or 12.75x24 Rubber at the rear.
Allis-Chalmers – other models: the collective page of the orange tractors from Milwaukee outside the named ranges, from the 10-18 and 20-35 through the letter models B, C, WC and WD to the 100s (170 to 220)
This page gathers the Allis-Chalmers tractors the register could not assign to a named range – the brand from Milwaukee, Wisconsin, that began in 1914 with the 10-18, was the first maker to introduce pneumatic tyres on a tractor with the Model U in 1932 and created the affordable small tractor for the American family farm with the Model B of 1937, before being sold to Deutz in 1985. The type logic: the early number types 10-18, 12-20 and 20-35 give drawbar and belt power in hp; the letter models A, B, C, CA, WC and WD of the 1930s to 1950s denote model types, not size; the D series (D-10 to D-21) of the 1950s and 1960s orders in ascending order; the 100s (160 to 220) of 1964 to 1975 give roughly the hp class, XT the turbocharger; the 7000s (7010 to 7080) of the 1970s with the Acousta Cab and the 8000s (8010 to 8070) of the 1980s are the last own ranges, the 4W-220 and 4W-305 the articulated tractors, the 5000s and 6000s bought-in compacts from Toyosha and Fiat. The engines are Allis-Chalmers' own as petrol, LPG and diesel versions, Perkins in some diesel models and Toyosha in the Japanese compacts.
Read on 3 more paragraphs
The register lists here 115 versions with 6 to 305 hp from two- to eight-cylinders of 1,002 to 11,973 cm³, widths from 915 to 2,438 mm and heights from 1,191 to 3,531 mm.
From the 1930s to the 1970s Allis-Chalmers was the third big American maker after John Deere and International Harvester; the Persian Orange tractors are collectors' pieces today with their own association, and the brand lived on through Deutz-Allis and AGCO Allis until 2001.
On used tractors, originality, engine condition (carburettor on petrol engines, injection pump on diesels), clutch and transmission (Power Director on the D-17 and the 100s), hydraulics (Traction Booster) and sheet metal count; parts run through collector dealers and AGCO for the late ranges.
Sources: SpecCodex register, model data: Allis-Chalmers (weitere Modelle), Allis-Chalmers (Wikipedia)
Technical data
Engine
| Engine make | Allis-Chalmers or Continentalcorrect |
|---|---|
| Fuel | petrolcorrect |
| Power | 20/31correct |
| Cylinders | 4correct |
| Displacement | 284 / 300 / 317 cu inchescorrect |
| Bore | 4.25 / 4.375 / 4.5 inchescorrect |
| Stroke | all 5 inchescorrect |
| Naturally aspirated | naturally aspiratedcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 118.5 inches (3000 mm)correct |
|---|---|
| Width | 63.1 inches (160 cm)correct |
| Height | 53.5 inches (135 cm)correct |
| Unladen weight | 4, 600 lbs (2086 kg])correct |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | manual gearboxcorrect |
| Gearbox make | Allis-Chalmerscorrect |
| Forward gears | 4correct |
| Reverse gears | 1correct |
| Front tyres | 28x6 steel or 6.00x16 rubbercorrect |
| Rear tyres | 42x11 steel or 12.75x24 Rubbercorrect |
Origin and approval
| Plant | USAcorrect |
|---|
Frequently asked questions
What engine does the Allis Chalmers Model U have?
4 cylinders, Benzin.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check front and rear tyre sizes: mismatched pairs strain the drivetrain.
- Shift the gearbox cold and warm — jumps only show up at temperature.
- Load the hydraulics and watch for sag.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 24 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Other models in this series
Sources: Wikipedia (CC BY-SA 4.0) (retrieved August 2026) · Values adopted and presented in our own form; changes from the source are possible. · Data sources and cross-checks
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